C3, C4, and CAM Plant Photosynthesis compared



C3, C4, and CAM Plant Photosynthesis compared

Q1: How did C3 Plants get their name? _____________________________

C4 Plants? _____________________________________________

Q2:

|What is/are the overall |What is/are the overall |What is/are the overall |

|function(s) of |function(s) of |function(s) of the Calvin |

|photosystem I? |photosystem II? |cycle? |

| | | |

| | | |

| | | |

| | | |

| | | |

Q3:

|Are the compounds |Photosystem I? |Photosystem II? |The Calvin cycle? |

|listed here used or | | | |

|produced in: | | | |

|Glucose | | | |

|O2 | | | |

|H2O | | | |

|CO2 | | | |

|ATP | | | |

|ADP + Pi | | | |

|NADPH | | | |

|NADP+ | | | |

C3 plants- stressful environments can and will kill these plants eventually. Ex. Fern

Q4:

a) Why do stressful environments affect C3 plants?

b) Explain photorespiration and why is this considered a quick fix for the plant?

c) Why is photorespiration an inefficient and wasteful method of carbohydrate production

Some call photorespiration a “mistake” in the functioning of the plant cell? Explain the Pros & Cons to that statement

C4 plants: these plants have a net photosynthesis rate of 2-3x as much as a C3 plant in a stressful environment. Ex. Corn

Q5:

a) How PGAL produced in a C4 plant?

b) What differs between C3 and C4 plants when their stomates close?

c) How is photorespiration avoided by C4 plants?

CAM plants: These plants thrive in very harsh environments. Ex. Cactus

Q6:

a) How do these plants conserve water?

b) How does the compound Malate contribute to the resistance of photorespiration by CAM plants?

c) What compound is reduced into PGAL by CAM plants

Q7: What makes C4 photosynthesis more efficient than C3 photosynthesis in tropical climates?

Q8: What makes C3 photosynthesis more efficient than C4 photosynthesis in temperate climates?

Q9: What makes CAM photosynthesis most efficient in desert climates?

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